WhyFi

Otherwise known as "trolling"?

Koyote

Nailed it.

aplcr0331

Well, I watched the video and a few more. Interesting dude, seems he's an engineer of some sort. The best video I watched was the one on crank arm length, he did some very cool modeling.

I've seen a lot worse video analyzing bike stuff that's for sure.

I give him major credit for calling out bike marketing flapdoodle, particularly in his video about the Specialized SL7 release. I thought he had great insight and didn't hold anything back.

On the materials front? Who knows, but I did send his video on Titanium frames to my buddy in the UK....can't wait for my friends head to explode when he watches that, lol.

The newest video on the Canyon problems was fascinating too.

ls01

twss

bruce19

Good grief. It was a tongue in cheek response.

datlas 

Reminder: No good deed goes unpunished. Sad!

bruce19

I guess this is not the place for attempts at humor. FWIW I saw a vid by a presenter I didn't know. I thought it was interesting. Now I feel like Diogenes searching for a material scientist.

tyrion

He's an engineer talking about engineering. What's wrong with that?

Koyote

Source? That's all I'm asking.

bruce19

I've tried to search for his name and background without success.

bruce19

He did make a statement I'd like to know more about. He claimed that Toray gives a value for the strength/rigidity (I can't remember the exact quality) of CF as a material. But, he added, 40% of an actual frame is the bonding agent and so that value does not equate directly to a frame value.

bruce19

From a site called "poddtoppen"........."A legendary former pro, multiple TdF stage winner and ex-British Champ described him to us as 'cycling's man of the moment' and we couldn't describe him any better. Dan Bigham is the founder of trade team Huub Watt Bike and the aero accessory company Watt Shop. He is one of the fastest pursuit and team pursuiters in the world. He was due to be going with his team to Bolivia to take on a number of work records at altitude. A disruptive thinker, utilising his engineering background to re-think the art of time trialling with changes that have spread throughout the cycling world. He also consults with some of the biggest teams - Danish Team Persuit, Canyon Sram, Jumbo Visma and works with the likes of Wout van Aert.

As if today's guest isn't enough, we were also joined by YouTube sensation, engineer and self-confessed aero geek Alex Thomas, whose YouTube channel – Peak Torque – is well worth checking out."

Apparently he's some kind of engineer.

bruce19

https://share.transistor.fm/s/3af1b470

Eric F 

Right. He claims that the stiffness number for CF is for the fibers only and does not take into account the resin used to bond the fibers together. He claims the resin has no significant stiffness of its own, and only dilutes the stiffness of the fibers. This seems to be his basis for his calculations in reducing the actual stiffness of CF material in a bicycle frame in comparison to aluminum. While I get that using just the raw fiber number is probably inaccurate, I have a hard time swallowing his claim that the resin has a value of zero.

Sojodave

I think disc brakes are better...oh wait, I thought we were still arguing about rim vs disc brakes. Carry on.

BillyD

Yes, I am. Plus I stayed at a Holiday Inn last night. My conclusion is . . . . steel is real.

bruce19

Uh oh. A new twist on the thread.

StanSeven

This is the conclusion many of us here reached years ago here. The one big unique advantage of CF is it can easily be shaped to give greater aero benefits or formed to add stiffness in just specific areas.

downhillmaster

Deliciously ironic.
On a forum noted for its endless amount of amateurs having spirited and technical discussions covering every single bicycle part and every aspect of cycling, there are all of a sudden so many fact checking credential seekers when it comes to anything negative said about CF.

znomit

We do a little CF work here and I’m involved in the design and testing. I ran the numbers once on a beam and they were spot on for calculating the deflection. Also told me we were using 3x the required resin, squeezing out resin is hard, but it’s really not rocket surgery.

Carbonfiberboy 

There is very fancy math involved: finite element analysis. One can use that on any frame material, but carbon gives the designer/engineer the ability to adjust the layup in real time as it were, and see how that affects the structural properties in which they are interested. So that's a good start.

But the best part is that they lay up a trial frame, build it out, and give it to the factory test rider or riders, like pilots. They report on the feel of the bike, which can then be altered for the next trial frame, etc. Thus the factory can tune the feel of the frame precisely to match the market for that frame model. That's huge. No guessing.

Didn't watch the video, but if it's not mentioned . . . there is no bike frame material which is the equal of epoxy/carbon for fatigue resistance. Maybe wood, but nothing else. OTOH, there's nothing quite as sensitive to notching and point impacts.

Sy Reene

I assume you're talking only about the riders who survive, right?

Koyote

I like my cf-framed bike, and will almost certainly buy another one someday. And I have applied the same healthy skepticism to plenty of other people and when discussing plenty of other subjects.

I think anyone should be leery of a person on youtube, earning money from clicks, who passes himself off as an "expert" in a highly technical field without offering anything that we might find on a cv. Materials Science and engineering is not something that is just picked up "on the street."

tomato coupe

There's a guy on another (non-bike) forum that insists he has a "common law PhD."

Koyote

Let me guess: economics?